I just tried it with whisky, and I have some suggestions to make the movement feel better:
- You should check out coyote time and jump buffering. That'll allow the player to jump even if they are off the ground by a few frames.
- Try setting the jump to trigger when the jump input is "pressed" instead of "just pressed", which would let the player keep jumping without releasing the button
Otherwise, game is great! I've made a much smaller speedrun game before also using brackey's tutorial and those changes really improved the feel of the game for me.